- Determine the toxicity and feasibility of high-dose thiotepa and cyclophosphamide with autologous peripheral blood stem cell (PBSC) transplantation and sargramostim (GM-CSF) followed by high-dose carboplatin, etoposide, and melphalan with second PBSC transplantation, GM-CSF, and isotretinoin after induction in children with newly diagnosed high-risk neuroblastoma.